<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index index-text="编号" border :show-row-hover="false">
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-circle-check" style="color:green" v-if="scope.row.cat_deleted === false" ></i>
          <i class="el-icon-circle-close" style="color:red" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order"  slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level === 1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <template slot="option">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete"  size="mini">删除</el-button>
        </template>
      </tree-table>
       <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="querInfo.pagenum"
      :page-sizes="[3, 5, 10, 15]"
      :page-size="querInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog
  title="添加分类"
  :visible.sync="addCatDialogVisible"
  width="50%" @close="addCateDialogClosed">
  <el-form :model="addCateForm" :rules="addCateRules" ref="addCateFormRef" label-width="100px" class="demo-ruleForm">
  <el-form-item label="分类名称" prop="cat_name">
    <el-input v-model="addCateForm.cat_name"></el-input>
  </el-form-item>
  <el-form-item label="父级分类">
      <!-- options 用来指定数据源 -->
      <!-- props 用来指定配置对象 -->
     <el-cascader v-model="selectedKeys" :options="parentCateList"
      :props="cascaderProps" @change="parentCateChange"
      clearable change-on-select></el-cascader>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addCatDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表，默认为空
      catelist: [],
      // 总数据条数
      total: 0,
      // 为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          // 使用模板列
          type: 'template',
          // 模板名称
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'option'
        }
      ],
      // 添加分类对话框
      addCatDialogVisible: false,
      // 添加分类数据
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      // 添加表单分类规则
      addCateRules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      },
      // 父级分类的列表
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: {
          value: 'cat_id',
          label: 'cat_name',
          expandTrigger: 'hover'
        },
        expandTrigger: 'hover'
      },
      // 绑定用户选择的分类值
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: this.querInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      // console.log(res.data)
      // 把数据列表，赋值给 catelist
      this.catelist = res.data.result
      // console.log(this.catelist)
      // 为总数据条数赋值
      this.total = res.data.total
    },
    // 监听页面大小改变
    handleSizeChange (newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听页面改变
    handleCurrentChange (newNum) {
      this.querInfo.pagenum = newNum
      this.getCateList()
    },
    showAddCateDialog () {
      this.getParentCateList()
      this.addCatDialogVisible = true
    },
    // 获取父级分类的列表
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) return this.$message.error('父级分类数据获取失败')
      // console.log(res.data)
      this.parentCateList = res.data
      console.log(this.parentCateList)
    },
    parentCateChange () {
    // 级联菜单中选择项发生变化时触发
      console.log(this.selectedKeys)
      // 如果用户选择了父级分类
      if (this.selectedKeys.length > 0) {
        // 则将数组中的最后一项设置为父级分类
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        // level也要跟着发生变化
        this.addCateForm.cat_level = this.selectedKeys.length
        return true
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
        return false
      }
    },
    // 点击安钮添加新的分类
    addCate () {
      this.$refs.addCateFormRef.validate(async val => {
        if (!val) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCatDialogVisible = false
      })
    },
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
